Sometimes you meet a person and you just don’t get along. You might feel that the person doesn’t like you or is cold towards you. In these situations, it is easy to get offended or to react by developing a dislike or even animosity towards that person.
When this happens to me, I try to imagine that Allah has somehow made that person privy to my sinfulness, perhaps subconsciously or something, and that person is reacting accordingly. After all, people who treat me nicely, respectfully, kindly, etc., only do so out of ignorance of my true self and if Allah were to will that that true self be revealed, that would be easy for Him. One can never know how Allah conceals and how He makes manifest.
With this mindset, it is also easier to remove animosity or bad feelings towards others from one’s heart before going to bed each night.